如何在Android的Orintation之后不重新创建活动？

Question

I have activity the contains a ListView , and this listview is filled with data from a web service in onCreate() function ( using AsyncTask ). When the screen orientation changes the activity is re-created, I don't want that. how to keep saved after changing the orientation

Answer 1

在AndroidManifest.xml中为该活动设置android:configChanges="orientation" 。

Answer 2

You need to add this in the Activity in AndroidManifest.xml. Just adding "orientation" will not work on all devices.

android:configChanges="orientation|screenSize"

Answer 3

Although the other answers suggest using android:configChanges , I would say this is really only a last resort option because it means resources for different orientations will not get loaded automatically.

Instead you should use the onSaveInstanceState or onRetainNonConfigurationInstance functions of your activity. (If you use fragments, you should use setRetainInstance instead of the latter option.)

Another option would be to use a ContentProvider to store the data you download using the AsyncTask into a database so it wouldn't need to be re-downloaded anyway.

You should read this for more information.